MATLAB: What happened to the folowing code

image

Code
% Choose default command line output for test2
handles.output = hObject;
% create an axes that spans the whole gui
ah = axes('unit', 'normalized', 'position', [0 0 1 1]);
% import the background image and show it on the axes
bg = imread('C:\Users\Romesha\Desktop\eye.jpg'); imagesc(bg);
% prevent plotting over the background and turn the axis off
 set(ah,'handlevisibility','off','visible','off')
set(bg,'alphadata',.1);
% making sure the background is behind all the other uicontrols uistack(ah, 'bottom');
% Update handles structure
guidata(hObject, handles);
 *Error*
>> test2
Error using set
Invalid handle
Error in test2>test2_OpeningFcn (line 63)
set(bg,'alphadata',.1);
Error in gui_mainfcn (line 221)
    feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure),
    varargin{:});
Error in test2 (line 42)
    gui_mainfcn(gui_State, varargin{:});

Best Answer

Nothing happened to it. bg is the result of imread(), which does not plot. The result of imread() is the data matrix of the image, which is not a handle. What you want to set() against is not bg but rather the result of the imagesc(bg)
Related Question